Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: Quantos recibos Mike Gravel tem?
 ###Tabelas: CREATE TABLE type_i (type_i_id AUTO_INCREMENT PRIMARY KEY, Part Number VARCHAR, Pins VARCHAR, Body Width/mm INT, Body Length/mm INT, Lead Pitch/mm INT) CREATE TABLE democrats (democrats_id AUTO_INCREMENT PRIMARY KEY, Candidate VARCHAR, Money Raised, 3Q VARCHAR, Loans Received, 3Q VARCHAR, Money Spent, 3Q VARCHAR, Total Receipts VARCHAR, Cash On Hand VARCHAR, After Debt VARCHAR) CREATE TABLE season_1:_2003–2004 (season_1:_2003–2004_id AUTO_INCREMENT PRIMARY KEY, Series # INT, Title VARCHAR, Directed by VARCHAR, Written by VARCHAR, Original air date VARCHAR, Production code INT) CREATE TABLE a_lyga (a_lyga_id AUTO_INCREMENT PRIMARY KEY, Position INT, Club VARCHAR, Games played INT, Wins INT, Draws INT, Loses INT, Goals scored INT, Goals conceded INT, Points INT) CREATE TABLE brazil_1950 (brazil_1950_id AUTO_INCREMENT PRIMARY KEY, Player VARCHAR, Club VARCHAR, Qualifying Goals INT, Finals Goals INT, Total Goals INT)  
SELECT Total Receipts FROM democrats WHERE Candidate = mike gravel